After the first contact on the Selection Workshop we had to work hard to prepare the next step: the Preliminary Design Review (PDR) and the Student Training Week (STW). But before this revision, it should be showed some project progress, like the publication on the Engineering School of Seville (ETSI). Another advance was the obtaining of wireless sensors by the microelectronics company, Adevice.

This stage of the review took place in February 2015 in Oberpfaffenhofen (Germany). On this time they met the selected teams: 4 of REXUS and other 4 of BEXUS. The Student Training Week was well organized, with a good balance between social activities and work with team presentations and question sessions with experts. Regarding the Preliminary Design Review , criticism and feedback from the panel of experts were highly instructive for further progress in the project. We highlight the implementation of the projects inside the gondola too, which will be the medium in which the experiment will go.